Science and Environment Quiz: Day 62

January 12, 2023

One of the following is an example for a permanent magnet.

(A) Electromagnet
(B) Mumetal
(C) Soft iron
(D) Neodymium

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Answer : D

Alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure

The most commonly used permanent magnets are made of ALNICO (An alloy of aluminium, nickel and cobalt). Magnets used in refrigerators, speakers, fridge and magnetic compass are some familiar examples of a permanent magnet. Neodymium magnets are the strongest and the most powerful magnets on the Earth

Consider the following statement :
1. Magnetic field lines always repel each other and do not intersect.
2. A transformer can step up direct current.
3. A generator converts mechanical energy into electrical energy.
Which of the statement is/are incorrect:

(A) Only 1 and 2
(B) Only 2 and 3
(C) Only 1 and 3
(D) None of the these

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Answer : C

Consider the following statement :
1. The force of attraction of a magnet is maximum at the poles.
2. A freely suspended magnet always comes to rest along the geographic north-south direction.
Which of the statement is/are correct:

(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2

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Answer : A

In which mode of transfer of heat, molecules pass on heat energy to neighbouring molecules without actually moving from their positions?

(A) Radiation
(B) Conduction
(C) Convection
(D) Both B and C

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Answer : B

Two cylindrical rods of same length have the area of cross section in the ratio 2:1. If both the rods are made up of same material, which of them conduct heat faster?

(A) Both rods
(B) Rod-2
(C) Rod-1
(D) None of them

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Answer : C

Consider the following statement:
1. For a given heat in liquid, the apparent expansion is more than that of real expansion.
2. Thermal energy always flows from a system at higher temperature to a system at lower temperature.
3. The SI unit of heat energy absorbed or evolved is joule (J)
Which of the statement is/are correct:

(A) Only 1 and 2
(B) Only 2 and 3
(C) Only 1 and 3
(D) All of the these

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Answer : B

Assertion: When water is heated up to 100oC, there is no raise in temperature until all water gets converted into water vapour.
Reason: Boiling point of water is 100°C

(A) If both assertion and reason are true and reason is the correct explanation of assertion.
(B) If both assertion and reason are true but reason is not the correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If assertion is false but reason is true.

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Answer : A

If a substance is heated or cooled, the change in mass of that substance is

(A) Positive
(B) Negative
(C) Zero
(D) None of the above

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Answer : C

Assertion: The Earth’s magnetic field is due to iron present in its core.
Reason: At a high temperature a magnet loses its magnetic property or magnetism

(A) If both assertion and reason are true and reason is the correct explanation of assertion.
(B) If both assertion and reason are true but reason is not the correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If assertion is false but reason is true.

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Answer : D

SI unit of temperature is

(A) Fahrenheit
(B) Joule
(C) Celsius
(D) Kelvin

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Answer : D

Consider the following statements with respect to the factors Limiting the Productivity of Aquatic Habitats
1. Sunlight penetration rapidly increases as it passes down the column of water.
2. Oxygen is less soluble in warm water.
Which of the above statements is/are Correct?

(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 and 2

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Answer : B

Vultures which used to be very common in Indian countryside some years ago are rarely seen nowadays. This is attributed to
1. Destruction of habitats of vultures
2. A drug used by cattle owners for treating their diseased cattle
3. Scarcity of food available to them
4. Widespread, persistent and fatal disease among them
5. Urbanization and Industrialization

(A) 2 only
(B) 1, 2 and 3 only
(C) 1, 2, 3 and 5 only
(D) 1, 2, 3, 4 and 5

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Answer : C

Which of the following is correct about CITES?
1. It contains provisions to protect wildlife species from illegal trade, habitat destruction and climate change.
2. It releases Red List of Endangered species with the help of IUCN.

(A) Only 1
(B) Both 1 and 2
(C) Only 2
(D) None

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Answer 😀

Man And Biosphere program is a global initiative of which of the International Organisation?

(A) IUCN
(B) UNESCO
(C) UNEP
(D) Conservation International

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Answer : B

Consider the statements given below in relation to Biosphere reserves
1. Biospheres are examples of artificial biomes.
2. This is the concept of UNESCO under which ecosystem and hereditary resources are conserved.
3. There are core, buffer and Transition area in Biosphere Reserves.
Select the correct answer using the codes given below:

(A) 1 and 2
(B) 2 only
(C) 2 and 3
(D) 1, 2 and 3

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Answer : C